| Data | Details |
|---|---|
| Hydrologic Unit Codes | 17050111 |
| Size | 759 square miles (486,036 acres) |
| Beneficial Uses Affected | Cold water aquatic life, salmonid spawning, primary and secondary contact recreation, domestic water supply |
| Major Land Uses | Forestry, roads, mining, agriculture/livestock, recreation |
| Date Approved by EPA | Subbasin assessment only; not subject to EPA approval |
Subbasin Characteristics
The North/Middle Fork Boise River subbasin is located in southwestern Idaho between Boise and Stanley. The subbasin includes the North and Middle Fork Boise River and all tributaries upstream from the confluence of the North and Middle Forks of the Boise River. The subbasin area is primarily federally owned and administered. Atlanta is the only recognized community in the watershed with year-round residents. Access is provided primarily by US Forest Service-maintained roads and by county-owned or county-maintained roads.
2002 Upper Boise River Watershed Assessment
The upper Boise River watershed is made up of two subbasins, as summarized in the table below.
| Data | Details |
|---|---|
| Hydrologic Unit Codes | 17050111 (North/Middle Fork Boise River Subbasin) 17050113 (South Fork Boise River Subbasin) |
| Size | 2,033 square miles (1,301,120 acres) |
| Beneficial Uses Affected | Cold water aquatic life, salmonid spawning, primary and secondary contact recreation, domestic water supply |
| Major Land Uses | Forestry, roads, mining, agriculture/livestock, recreation |
Located in southwestern Idaho, the upper Boise River watershed is about 2,033 square miles of predominantly undeveloped forestland and open range with both managed and free-flowing streams. The upper Boise River watershed is comprised of the two hydrologic cataloging units of the Boise River system upstream of Arrowrock Reservoir. The waters of the subbasin join to form the Arrowrock Reservoir, which supplies water to Lucky Peak Reservoir and the lower Boise River.
This subbasin assessment found that all § 303(d)-listed water bodies within the upper Boise River watershed are currently fully supporting all of their beneficial uses and are no longer candidates for TMDL development.
The subbasin assessment also lists water bodies not fully supporting their beneficial uses that should be added to the § 303(d) list during the next listing cycle.
2002 Summary of Assessment Outcomes On 1998 § 303(d) List
| Stream | Details |
|---|---|
| Buck Creek | Delist; no TMDL needed |
| Willow Creek | Delist; no TMDL needed |
| South Fork Boise River | Delist; no TMDL needed |
| Deer Creek | Delist; no TMDL needed |
| Little Smoky Creek | Delist; no TMDL needed |
| Cayuse Creek | Delist; no TMDL needed |
| North Fork Feather Creek | Delist; no TMDL needed |
| Smith Creek | Delist; no TMDL needed |
| Rattlesnake Creek | Delist; no TMDL needed |
| Not on 1998 § 303(d) List | |
| Crooked River | Add to § 303(d) list for sediment |
| Beaver Creek | Add to § 303(d) list for sediment |
| Rabbit Creek | Add to § 303(d) list for unknown pollutant |
| Meadow Creek | Add to § 303(d) list for sediment |
| French Creek | Add to § 303(d) list for sediment |
| Little Camas Reservoir | Add to § 303(d) list for sediment |
Subbasin Documents
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